- 您现在的位置：买卖IC网 > PDF目录20896 > LT3590ESC8#TRPBF (Linear Technology)IC LED DRVR WHITE BCKLGT SC-70-8 PDF资料下载
参数资料
| 型号： | LT3590ESC8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT SC-70-8 |
| 标准包装： | 2,500 |
| 拓扑： | PWM，降压（降压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 650kHz ~ 1.05MHz |
| 电源电压： | 4.5 V ~ 55 V |
| 输出电压： | 55V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VFSOP（0.492"，1.25mm 宽） |
| 供应商设备封装： | SC-70-8 |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
LT3590
APPLICATIONS INFORMATION
t PERIOD =
= = 0 . 01 s
Direct PWM Dimming
Changing the forward current ?owing in the LEDs not only
changes the intensity of the LEDs, it also changes the color.
The chromaticity of the LEDs changes with the change in
forward current. Many applications cannot tolerate any
shift in the color of the LEDs. Controlling the intensity of
the LEDs with a direct PWM signal allows dimming of the
LEDs without changing the color. In addition, direct PWM
dimming offers a wider dimming range to the user.
48V input voltage. The achievable dimming range for this
application and 100Hz PWM frequency can be determined
using the following method.
Example:
? = 100 Hz , t SETTLE = 50 μs
1 1
? 100
= = 200 : 1
Dimming the LEDs via a PWM signal essentially involves
turning the LEDs on and off at the PWM frequency. The
typical human eye has a limit of ~60 frames per second.
D i m Range =
t PERIOD
t SETTLE
0.01s
50 μs
By increasing the PWM frequency to ~80Hz or higher,
the eye will interpret that the pulsed light source is con-
tinuously on. Additionally, by modulating the duty cycle
Min Duty Cycle =
t SETTLE
t PERIOD
? 100 =
50μs
0 . 01 s
? 1000 = 0 . 5 %
(amount of “on-time”), the intensity of the LEDs can be
controlled. The color of the LEDs remains unchanged in
this scheme since the LED current value is either zero or
a constant value.
The time it takes for the LED current to reach its pro-
grammed value sets the achievable dimming range for a
given PWM frequency. For example, the settling time of
the LED current in Figure 6 is approximately 50μs for a
PWM
5V/DIV
V SW
20V/DIV
Duty Cycle Range = 100 % → 0 . 5 % at 100 Hz
The calculations show that for a 100Hz signal the dimming
range is 200 to 1. In addition, the minimum PWM duty
cycle of 0.5% ensures that the LED current has enough
time to settle to its ?nal value. Figure 7 shows the dim-
ming range achievable for three different frequencies with
a settling time of 50μs.
100Hz
1kHz
10kHz
I LED
20mA/DIV
V IN = 48V
4 LEDs
2ms/DIV
3590 F06
1
10
100
1000
PWM DIMMING RANGE
3590 F07
Figure 6. Direct PWM Dimming Waveforms
Figure 7. Dimming Range Comparison
of Three PWM Frequencies
3590f
10
相关PDF资料 |
PDF描述 |
|---|---|
| LT3590EDC#TRPBF | IC LED DRIVER WHITE BCKLGT 6-DFN |
| P51-200-A-AF-MD-4.5OVP-000-000 | SENSOR 200PSI 9/16-18 UNF 4.5V |
| LT1932ES6#TR | IC LED DRIVR WHITE BCKLGT TSOT-6 |
| 983-10ES-WHITE-2"X12"-BUL | CONSPICUITY MARKING 2"X 12" WHT |
| P51-1000-A-Z-M12-20MA-000-000 | SENSOR 1000PSI 1/4-18NPT 4-20MA |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3591 | 制造商:LINER 制造商全称:Linear Technology 功能描述:20mA LED Driver and OLED Driver with Integrated Schottky in 3mm x 2mm DFN |
| LT3591EDDB#PBF | 制造商:Linear Technology 功能描述:LED DRVR 10Segment 3.3V/5V/9V 8-Pin DFN EP 制造商:Linear Technology 功能描述:LED DRIVER BOOST PWM/ANALOGU 制造商:Linear Technology 功能描述:LED DRIVER, BOOST, PWM/ANALOGUE, 1MHZ, DFN-8; Topology:Boost (Step Up); No. of Outputs:1; Output Voltage:42V; Driver Case Style:DFN; Input Voltage Min:2.5V; Input Voltage Max:12V; Dimming Control Type:PWM / Analogue ;RoHS Compliant: Yes |
| LT3591EDDB#TRMPBF | 功能描述:IC LED DRIVER WHITE BCKLGT 8-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:60 系列:- 恒定电流:- 恒定电压:- 拓扑:线性（LDO），PWM，升压（升压） 输出数:8 内部驱动器:是 类型 - 主要:背光 类型 - 次要:RGB，白色 LED 频率:500kHz ~ 1.5MHz 电源电压:4.75 V ~ 26 V 输出电压:45V 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* 工作温度:-40°C ~ 85°C |
| LT3591EDDB#TRPBF | 功能描述:IC LED DRIVER WHITE BCKLGT 8-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| LT3591EDDBTRMPBF | 制造商:Linear Technology 功能描述:LED Driver 10-Seg 3.3/5/9V DFN8EP |
发布紧急采购，3分钟左右您将得到回复。